ST16C654IJ68-F Datasheet, PDF (1/51 Pages) Exar Corporation – 2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO

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ST16C654/654D
2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
AUGUST 2005
GENERAL DESCRIPTION
FEATURES
REV. 5.0.2
The ST16C654/654D¹ (654) is an enhanced quad
Universal Asynchronous Receiver and Transmitter
(UART) each with 64 bytes of transmit and receive
FIFOs, transmit and receive FIFO trigger levels,
automatic hardware and software flow control, and
data rates of up to 1.5 Mbps. Each UART has a set
of registers that provide the user with operating status
and control, receiver error indications, and modem
serial interface controls. Selectable interrupt polarity
provides flexibility to meet design requirements. An
internal loopback capability allows onboard
diagnostics. The 654 is available in 64 pin LQFP, 68
pin PLCC and 100 pin QFP packages. The 64 pin
package only offers the 16 mode interface, but the 68
and 100 pin packages offer an additional 68 mode
interface which allows easy integration with Motorola
processors. The ST16C654CQ64 (64 pin) offers
three state interrupt output while the
ST16C654DCQ64 provides continuous interrupt
output. The 100 pin package provides additional
FIFO status outputs (TXRDY# and RXRDY# A-D),
separate infrared transmit data outputs (IRTX A-D)
and channel C external clock input (CHCCLK). The
ST16C654/654D is compatible with the industry
standard ST16C454 and ST16C654/554D.
NOTE: 1 Covered by U.S. Patent #5,649,122.
• Pin-to-pin compatible with ST16C454, ST16C554
and TI’s TL16C554AFN and TL16C754BFN
• Intel or Motorola Data Bus Interface select
• Four independent UART channels
■ Register Set Compatible to 16C550
■ Data rates of up to 1.5 Mbps
■ 64 Byte Transmit FIFO
■ 64 Byte Receive FIFO with error tags
■ 4 Selectable TX and RX FIFO Trigger Levels
■ Automatic Hardware (RTS/CTS) Flow Control
■ Automatic Software (Xon/Xoff) Flow Control
■ Progammable Xon/Xoff characters
■ Wireless Infrared (IrDA 1.0) Encoder/Decoder
■ Full modem interface
• 2.97V to 5.5V supply operation
• Sleep Mode (200 uA typical)
• Crystal oscillator or external clock input
APPLICATIONS
• Portable Appliances
• Telecommunication Network Routers
• Ethernet Network Routers
• Cellular Data Devices
• Factory Automation and Process Controls
FIGURE 1. ST16C654 BLOCK DIAGRAM
A2:A0
D7:D0
IOR#
IOW#
CSA#
CSB#
CSC#
CSD#
INTA
INTB
INTC
INTD
CHCCLK
TXRDY# A-D
RXRDY# A-D
Reset
16/68#
INTSEL
CLKSEL
Data Bus
Interface
UART Channel A
UART
Regs
BRG
64 Byte TX FIFO
TX & RX
IR
ENDEC
64 Byte RX FIFO
UART Channel B
(same as Channel A)
UART Channel C
(same as Channel A)
UART Channel D
(same as Channel A)
Crystal Osc/Buffer
2.97V to 5.5V VCC
GND
TXA, RXA, IRTXA, DTRA#,
DSRA#, RTSA#, CTSA#,
CDA#, RIA#
TXB, RXB, IRTXB, DTRB#,
DSRB#, RTSB#, CTSB#,
CDB#, RIB#
TXC, RXC, IRTXC, DTRC#,
DSRC#, RTSC#, CTSC#,
CDC#, RIC#
TXD, RXD, IRTXD, DTRD#,
DSRD#, RTSD#, CTSD#,
CDD#, RID#
XTAL1
XTAL2
654 BLK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com